![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/ReleaseNotes b/ReleaseNotes
index 6a987133027fd2ca57647de53566d6327a08c0ab..f9677e3939fc3c1c5b34d2df2fb33d921537fe54 100644 (file)
--- a/ReleaseNotes
+++ b/ReleaseNotes
and very detailed list of changes can be obtained from the Git logs for each
release.
+ Compatibility Note:
+ ~~~~~~~~~~~~~~~~~~~
+
+ All pre 1.0 development snapshots are not considered stable yet. That is,
+ all interfaces, including the plugin API, the network protocol, or the query
+ language, may change in an incompatible way at any time. All changes are
+ documented here.
+
About SysDB:
~~~~~~~~~~~~
“System DataBase” (SysDB) is a multi-backend system management and inventory
Object names are canonicalized before they are added to the store to ensure
a consistent view of your infrastructure.
- <http://sysdb.io/>
+ <https://sysdb.io/>
+
+Version 0.6.0, Release Date: 2014-11-17
+---------------------------------------
+
+ This release focuses on a clearer query language. The underlying
+ architecture has been refactored to allow for more powerful and generic
+ expressions.
+
+ * core:
+ - Added support for arrays. Elements may be of any other supported
+ data-type but only integers, decimals, and strings are fully supported.
+ * store:
+ - Refactored matchers: all matchers now operate on one or two expressions
+ or other matchers, replacing the old and less flexible conditional
+ matchers.
+ - Attribute values may now be used anywhere in an expression.
+ - On data-type mismatch when comparing attribute values, the values will
+ be cast to string (previously only done for regex matches).
+ - Added support for querying an object's backends (array of strings).
+ - Added support for iterating child objects and array values.
+ - All matchers now return false if any operand is NULL (except for IS
+ NULL).
+ - All operations now return NULL if any operand is NULL.
+ - Fixed behavior of not-operators (!=, !~) and let them not match if any
+ of the operands is NULL.
+ - Add support for looking up all object types (hosts, services, metrics).
+ - Refactored the JSON formatter to be more flexible and powerful.
+ - Record parent objects for each stored object.
+ * frontend:
+ - Added a separate parser mode for expressions.
+ - Added a new queryable field 'name' to be used in place of the rather
+ magical keyword 'host' when looking up hosts.
+ - Improved error reporting in the parser and the (newly introduced)
+ analyzer.
+ - Apply filters to hosts in the FETCH command.
+ * query language:
+ - All operators may now be used in all places if the involved data-types
+ support the respective operation. For example, regular expressions may
+ be used to match any value. Non-string values are cast to strings for
+ that purpose. IS NULL / IS NOT NULL may be applied to arbitrary
+ expressions.
+ - Introduced the 'IN' operator to check if a value or an array of values
+ is included in an array.
+ - Added support for arrays: [<elem1>,<elem2>,...]
+ - Added support for string and array concatenation using the '||'
+ operator.
+ - Attribute names have to be strings instead of identifiers now.
+ - Access object fields using '<field>' rather than '.<field>'.
+ - Let the LOOKUP and FETCH commands support services and metrics.
+ - Introduced 'FETCH service|metric <host>.<name' for fetching services
+ and metrics.
+ - Added support for 'ANY' and 'ALL' operators which apply a matcher to
+ each value emitted by an iterator (a host's services and metrics or
+ arrays). 'MATCHING ANY service|metric|attribute <cmp> <expr>' replaces
+ 'MATCHING service|metric|attribute <cmp> <value>' expressions.
+
+Version 0.5.0, Release Date: 2014-10-06
+---------------------------------------
+
+ This release focuses on simplifications and more flexibility in the frontend
+ and the query language. Most of those changes are not backward-compatible
+ but easy client implementations.
+
+ * sysdb:
+ - Include priority when printing log messages.
+ - Fixed handling of empty queries.
+ * store:
+ - When serializing the entire store (LIST command), return an array of
+ host objects (rather than wrapping it into another object).
+ - Fixed JSON format of time-series data.
+ - Fixed error checks of invalid compare expressions and reject them.
+ - Fixed lookups by back-end name.
+ - Added support for comparing attributes with different types by
+ comparing their string values.
+ * frontend:
+ - Clarified details about asynchronous messages and authentication
+ options and made client implementation more robust.
+ - Introduced a new message type encoding the JSON serialized response of
+ a query and its data type.
+ - Include the priority in log messages.
+ - Include object types in FETCH, LIST, and LOOKUP messages.
+ - Added support for including services and metrics in LIST responses and
+ skip hosts without the respective children.
+ * query language:
+ - Added support for services and metrics to LIST command.
+ - Changed syntax for attribute lookup to 'attributes[<name>]'.
+ - Changed syntax for accessing queryable fields to '.<field>'.
+ * utils:
+ - strbuf: Improved memory management.
+
+Version 0.4.0, Release Date: 2014-09-01
+---------------------------------------
+
+ This release features support for metrics and transparent access to a
+ backend's time-series data. Some backward-incompatible changes were applied
+ to some query commands for more consistency.
+
+ * build system:
+ - Added checks for format strings and arguments.
+ - Changed configure option for collectd::unixsock to
+ --enable-collectd-unixsock.
+ * core:
+ - Added support for “metric” objects which may be assigned to a host.
+ - Introduced support for handling time-series data: added new data
+ structures describing time-series data and a new type of plugins called
+ “time-series fetchers” which are used to access time-series
+ information.
+ * store:
+ - Fixed a memory leak.
+ - Apply (very) simple optimizations to lookup expressions.
+ - Added support for metrics and their “data-stores” (describing how to
+ access the actual data referenced by a metric).
+ - Added support for querying time-series data through the newly
+ introduced “time-series fetcher” plugins.
+ * frontend:
+ - Fixed a bug that might have caused reading too much data from the
+ connection buffer in certain situations.
+ * query language:
+ - The ‘MATCHING’ clause is now optional in ‘LOOKUP’ queries.
+ - The ‘LIST’ and ‘FETCH’ commands support ‘FILTER’ clauses as well.
+ - ‘LIST’ / ‘FETCH’ were changed to ‘LIST hosts’ / ‘FETCH host’.
+ - Added the ‘TIMESERIES’ command to query arbitrary time-series which
+ fetches time-series data from a backend's data-store for a given period
+ of time.
+ - Added support for date/time values.
+ - Added support for single quotes in string values: two adjacent single
+ quotes may be used to specify a single quote.
+ * documentation:
+ - Documented the frontend protocol in frontend/proto.h.
+ - Documented changes to the query language and new / updated plugins.
+ - Documented all supported data types.
+
+ Backends:
+ * collectd::unixsock:
+ - The plugin now uses metrics in place of services.
+ - New config options ‘TimeseriesBackend’ and ‘TimeseriesBaseURL’ to
+ specify access to time-series, currently limited to ‘rrdtool’ and
+ ‘rrdcached’ access.
+
+ Plugins:
+ * timeseries::rrdtool:
+ - New plugin adding support to fetch time-series from local RRD files.
+ - Supports flushing of values in RRDCacheD.
Version 0.3.0, Release Date: 2014-08-01
---------------------------------------
- Store plugin identifier (host, plugin, plugin_instance, type,
type_instance) as service attributes.
-Version 0.2.0, Release Date: 2014-07-01
+Version 0.2.0, Release Date: 2014-07-02
---------------------------------------
This is another development snapshot of SysDB. The main focus of this